What are some cool fish that can live with a Birchir that won't be eaten by it?

Disc-shaped cichlids, severums, uarus, loaches (not serpentine species , of course). Basically anything that won't fit in its mouth should be fine. If yours is a Senegal species, you have plenty of options. Endlis and some species however will try to gorge several fish.

I'm ready for the pressure.
The drama and the pleasure!If there is one thing I want to see here, it's HUMOR.I believe I can fly!
I believe I can touch the sky!
I think about it every night and day!I stand in awe of my body.

I have some discus tetra Brachychalcinus orbicularis and redfinned tetra Tetragonopterus argenteus with mine.
also I have a school of 9 (4+ inch) clown loaches) and a Fire eel Mastacembelus erythrotaenia
the upper level is occupied by 5 apollo sharks Luciosoma Sp.

Amazingly enough I also have a pair of jewel chichlids Hemichromis bimaculatus, which although only 3-4 inch see off my 18 inch ornate if he gets too close to them.